单词：double-halix
double-halix的用法和样例：
例句
- Double helical structure of DNA and types of DNA helices.去氧核糖核酸的双螺旋结构与其类别。
- The two strands of the double helix are linked by pairs of nucleic acids like the treads in a spiral staircase.这个双螺旋结构的两股之间是由成对的核酸联结的，它们就像螺旋式楼梯中的踏步板。
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